One of my friends back in High School was a Warhammer GM and one of the items he was proudest of owning for WHFRP was the book called Realm of Chaos (1990 edition). From what he told me back then, the book was really hard to come by, and of course the included elements of graphic violence and sexuality appealed to us in our teenage years. The book apparently contained both RPG and Miniatures related rules.

Was the book really that good or useful?

I never saw the 1995 version which apparently added even more contents. How different are the two editions?